Mode photonic crystal fiber comprises a core of a substantially transparent material having a core. Said core material having a core refractive index and length, and having a core diameter. Surrounding said optical fiber further comprises a core material at the outer cladding region. The cladding re.....
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The present invention discloses a phase lead compensation network, power converters, and closed-loop control system, the phase lead compensation network is provided in the power converter closed-loop control system, the closed loop control system further comprises: power converter and control module.....
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一种测试纺织品刚度的装置，包括一带有沿立柱延伸的刻度和在立柱顶部的支撑表面的立柱。在立柱上连接有构件。该构件带有沿与立柱垂直的方向延伸的刻度。构件可以沿立柱滑动和固定在立柱上。一重物放置在纺织品样品上以便将样品固定在适当位置。测试方法包括将纺织品样品放置在表面上并使纺织品样品的一部分延伸超过表面边缘。然后构件上升到支撑样品的位置，再下降到样品不再受到支撑的位置。从水平和垂直刻度读出读数用于计算。
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